Question: Who is the spouse of Robert Schumann in the year 1840?
Paraphrase: Who is Robert Schumann's wife in 1840?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q7351 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1840')) }